/* bzflag
 * Copyright (c) 1993-2020 Tim Riker
 *
 * This package is free software;  you can redistribute it and/or
 * modify it under the terms of the license found in the file
 * named COPYING that should have accompanied this file.
 *
 * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#include "network.h"

//Includes common to all platforms
#include <cstdio>
#include <cstring>
#include <vector>
#include <string>

#include "ErrorHandler.h"

#if !defined(WIN32)

#include <fcntl.h>
#include <ctype.h>
#include <errno.h>
#include <netdb.h>

#if defined(sun)
#define hstrerror(x) "<network error>"
#endif

extern "C" {

    void            nerror(const char* msg)
    {
        std::vector<std::string> args;
        if (msg)
        {
            args.push_back(msg);
            args.push_back(strerror(errno));
            printError("{1}: {2}", &args);
        }
        else
        {
            args.push_back(strerror(errno));
            printError("{1}", &args);
        }
    }

    void            bzfherror(const char* msg)
    {
        std::vector<std::string> args;
        if (msg)
        {
            args.push_back(msg);
            args.push_back(hstrerror(h_errno));
            printError("{1}: {2}", &args);
        }
        else
        {
            args.push_back(hstrerror(h_errno));
            printError("{1}", &args);
        }
    }

    int         getErrno()
    {
        return errno;
    }

}

int         BzfNetwork::setNonBlocking(int fd)
{
    /* XXX: FIXME: net_server -> use setsockopt() */
    int mode = fcntl(fd, F_GETFL, 0);
    if (mode == -1 || fcntl(fd, F_SETFL, mode | O_NONBLOCK) < 0)
        return -1;
    return 0;
}

int         BzfNetwork::setBlocking(int fd)
{
    int mode = fcntl(fd, F_GETFL, 0);
    if (mode == -1 || fcntl(fd, F_SETFL, mode & ~O_NONBLOCK) < 0)
        return -1;
    return 0;
}

#else /* defined(_WIN32) */

extern "C" {

    int         inet_aton(const char* cp, struct in_addr* pin)
    {
        unsigned long a = inet_addr(cp);
        if (a == (unsigned long)-1)
        {
            // could be an error or cp could be a broadcast address.
            // FIXME -- this check is a little simplistic.
            if (strcmp(cp, "255.255.255.255") != 0) return 0;
        }

        pin->s_addr = a;
        return 1;
    }

// win32 apparently cannot lookup error messages for us
    static const struct
    {
        int code;
        const char* msg;
    } netErrorCodes[] =
    {
        /* 10004 */{WSAEINTR,       "The (blocking) call was canceled via WSACancelBlockingCall"},
        /* 10009 */{WSAEBADF,       "Bad file handle"},
        /* 10013 */{WSAEACCES,      "The requested address is a broadcast address, but the appropriate flag was not set"},
        /* 10014 */{WSAEFAULT,      "Invalid pointer value, or buffer is too small (WSAEFAULT)"},
        /* 10022 */{WSAEINVAL,      "Invalid argument (WSAEINVAL)"},
        /* 10024 */{WSAEMFILE,      "No more file descriptors available"},
        /* 10035 */{WSAEWOULDBLOCK, "Socket is marked as non-blocking and no connections are present or the receive operation would block"},
        /* 10036 */{WSAEINPROGRESS, "A blocking Windows Sockets operation is in progress"},
        /* 10037 */{WSAEALREADY,    "The asynchronous routine being canceled has already completed"},
        /* 10038 */{WSAENOTSOCK,    "At least on descriptor is not a socket"},
        /* 10039 */{WSAEDESTADDRREQ,    "A destination address is required"},
        /* 10040 */{WSAEMSGSIZE,    "The datagram was too large to fit into the specified buffer and was truncated"},
        /* 10041 */{WSAEPROTOTYPE,  "The specified protocol is the wrong type for this socket"},
        /* 10042 */{WSAENOPROTOOPT, "The option is unknown or unsupported"},
        /* 10043 */{WSAEPROTONOSUPPORT, "The specified protocol is not supported"},
        /* 10044 */{WSAESOCKTNOSUPPORT, "The specified socket type is not supported by this address family"},
        /* 10045 */{WSAEOPNOTSUPP,  "The referenced socket is not a type that supports that operation"},
        /* 10046 */{WSAEPFNOSUPPORT,    "BSD: Protocol family not supported"},
        /* 10047 */{WSAEAFNOSUPPORT,    "The specified address family is not supported"},
        /* 10048 */{WSAEADDRINUSE,  "The specified address is already in use"},
        /* 10049 */{WSAEADDRNOTAVAIL,   "The specified address is not available from the local machine"},
        /* 10050 */{WSAENETDOWN,    "The Windows Sockets implementation has detected that the network subsystem has failed"},
        /* 10051 */{WSAENETUNREACH, "The network can't be reached from this hos at this time"},
        /* 10052 */{WSAENETRESET,   "The connection must be reset because the Windows Sockets implementation dropped it"},
        /* 10053 */{WSAECONNABORTED,    "The virtual circuit was aborted due to timeout or other failure"},
        /* 10054 */{WSAECONNRESET,  "The virtual circuit was reset by the remote side"},
        /* 10055 */{WSAENOBUFS,     "No buffer space is available or a buffer deadlock has occured. The socket cannot be created"},
        /* 10056 */{WSAEISCONN,     "The socket is already connected"},
        /* 10057 */{WSAENOTCONN,    "The socket is not connected"},
        /* 10058 */{WSAESHUTDOWN,   "The socket has been shutdown"},
        /* 10059 */{WSAETOOMANYREFS,    "BSD: Too many references"},
        /* 10060 */{WSAETIMEDOUT,   "Attempt to connect timed out without establishing a connection"},
        /* 10061 */{WSAECONNREFUSED,    "The attempt to connect was forcefully rejected"},
        /* 10062 */{WSAELOOP,       "Undocumented WinSock error code used in BSD"},
        /* 10063 */{WSAENAMETOOLONG,    "Undocumented WinSock error code used in BSD"},
        /* 10064 */{WSAEHOSTDOWN,   "Host is down"},
        /* 10065 */{WSAEHOSTUNREACH,    "No route to host"},
        /* 10066 */{WSAENOTEMPTY,   "Undocumented WinSock error code"},
        /* 10067 */{WSAEPROCLIM,    "Too many processes"},
        /* 10068 */{WSAEUSERS,      "Undocumented WinSock error code"},
        /* 10069 */{WSAEDQUOT,      "Undocumented WinSock error code"},
        /* 10070 */{WSAESTALE,      "Undocumented WinSock error code"},
        /* 10071 */{WSAEREMOTE,     "Undocumented WinSock error code"},
        /* 10091 */{WSASYSNOTREADY, "Underlying network subsytem is not ready for network communication"},
        /* 10092 */{WSAVERNOTSUPPORTED, "The version of WinSock API support requested is not provided in this implementation"},
        /* 10093 */{WSANOTINITIALISED,  "WinSock subsystem not properly initialized"},
        /* 10101 */{WSAEDISCON,     "Virtual circuit has gracefully terminated connection"},
        /* 11001 */{WSAHOST_NOT_FOUND,  "Host not found"},
        /* 11002 */{WSATRY_AGAIN,   "Host not found"},
        /* 11003 */{WSANO_RECOVERY, "Host name lookup error"},
        /* 11004 */{WSANO_DATA,     "No data for host"},
        /* end   */{0,          NULL}
    };

    void            nerror(const char* msg)
    {
        const int err = getErrno();
        const char* errmsg = "<unknown error>";
        for (int i = 0; netErrorCodes[i].code != 0; ++i)
            if (netErrorCodes[i].code == err)
            {
                errmsg = netErrorCodes[i].msg;
                break;
            }
        if (msg)
        {
            char buf[50];
            std::vector<std::string> args;
            args.push_back(msg);
            args.push_back(errmsg);
            sprintf(buf, "%d", err);
            args.push_back(buf);
            printError("{1}: {2} ({3})", &args);
        }
        else
        {
            char buf[50];
            std::vector<std::string> args;
            args.push_back(errmsg);
            sprintf(buf, "%d", err);
            args.push_back(buf);
            printError("{1} ({2})", &args);
        }
    }

    void            herror(const char* msg)
    {
        nerror(msg);
    }

    int         getErrno()
    {
        return WSAGetLastError();
    }

}

int         BzfNetwork::setNonBlocking(int fd)
{
    int on = 1;
    return ioctl(fd, FIONBIO, &on);
}

int         BzfNetwork::setBlocking(int fd)
{
    int off = 0;
    return ioctl(fd, FIONBIO, &off);
}

#endif /* defined(_WIN32) */

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